How Our Microbiome and Bacteria Depend on Hormones
- Introduction
● The human body is home to trillions of microorganisms — the microbiome.
● It lives in the gut, skin, mouth, and especially in the vaginal ecosystem.
● These bacteria are not passive — they “communicate” with our hormones and even regulate how we metabolize them. - Gut Microbiome and Estrogen
● In the gut, there is a group of bacteria called the estrobolome.
● Its role: break down estrogens and regulate how much active estrogen is reabsorbed into the bloodstream.
● When the estrobolome is healthy → estrogen is balanced.
● When disrupted (dysbiosis, constipation, poor diet) → estrogen dominance or deficiency can occur.
● Symptoms: PMS, heavy periods, endometriosis, fibroids, weight gain, mood swings. - Vaginal Microbiome and Hormones
● Dominant bacteria: Lactobacillus species.
● They produce lactic acid → maintain pH ~3.8–4.5 → protect against infections.
● Estrogen supports lactobacillus growth (thicker vaginal lining, more glycogen).
● When estrogen drops (postpartum, menopause) → lactobacillus levels fall → higher risk of infections, dryness, irritation. - Hormonal Fluctuations Across the Cycle
● Follicular phase (estrogen rises): microbiome diversity increases, lactobacilli thrive.
● Luteal phase (progesterone rises): immune response shifts, sometimes more susceptibility to candida/bacterial imbalance.
● Menopause (low estrogen): vaginal microbiome shifts → less protection, more pathogens. - External Factors that Influence Both Hormones and Microbiome
● Diet: fiber, prebiotics, probiotics, phytoestrogens.
● Stress: cortisol disrupts gut barrier, increases inflammation.
● Sleep: regulates melatonin, which impacts gut motility and microbiota rhythms.
● Antibiotics / medications: can damage microbiome → hormonal imbalance worsens.
● Endocrine disruptors: chemicals from plastics, cosmetics, pesticides alter both microbes and hormone signaling. - Supporting the Microbiome for Hormonal Health
● Nutrition:
○ Fiber-rich foods (vegetables, legumes, whole grains).
○ Fermented foods (sauerkraut, kimchi, kefir, yogurt).
○ Prebiotics (onion, garlic, asparagus, leeks).
● Supplements: probiotics (lactobacillus, bifidobacterium), omega-3, magnesium.
● Lifestyle: regular bowel movements, stress reduction, good sleep hygiene.
● Avoid: unnecessary antibiotics, high sugar, processed foods, alcohol excess. - Key Message
● The microbiome and hormones are a two-way street.
● Hormones shape which bacteria grow, and bacteria decide how hormones are metabolized.
● By nurturing the microbiome, women can support balanced cycles, fertility, immunity, and even mood.
There are no comments